I am much obliged to Shaykh Prof. Farahat al-Jaabiri (Tunisia), Mr. Sulayman Babziz, and Mr. Mohammed Hadj Saïd of Mzab, Algeria, and to Dr. Sassi ben Yahyaten of Belgium for kindly providing me with the digital version of the two new manuscripts. I also would like to extend my gratitude to Prof. Sabine Schmidtke, Mrs. Marian Zelazny (Princeton IAS), Prof. Ridwan El-Sayed (Lebanon), Dr. Khalid Omar (Egypt), Rev. Chris Howitz and James Budd (United Kingdom), Prof. Ersilia Francesca (Naples L’ Orientale), Prof. Angliki Ziaka (Aristotle University), Prof. Adam Gaiser and Amanda Propst (FSU, USA), and Jana Newiger (University of Göttingen). I am very grateful to Prof. Sebastian Günther (University of Göttingen) and Prof. Hinrich Biesterfeldt (Ruhr-Universität Bochum) for their enormous guidance and advice. Finally, I would like to express my special thanks and gratitude to Teddi Dols, Pieter te Velde, and their colleagues at Brill.

I wish to express my gratitude to Prof. Ayatollah Hossein Modarressi for his companionship on this project, and my sincere thanks to him for his insightful and most helpful suggestions at every stage in bringing this volume to completion.

The basic work in preparing the edition was carried out during an invited visit at the Institute for Advanced Study in Princeton from January–April 2018. My thanks are due to the institute for offering an ideal environment for joint scholarly research. I also wish to express my thanks to the Patricia Crone fellowship, which provided the funding for my stay at the Institute.